.fade-enter , .fade-appear{
    opacity: 0;
} 
.fade-enter-active , .fade-appear-active{
    opacity: 1;
    transition: opacity 1s ease-in ;
} 
.fade-enter-done{
    opacity: 1;
}
.fade-exit{
    opacity: 1;
} 
.fade-exit-active{
    opacity: 0;
    transition: opacity 1s ease-in ;
} 
.fade-exit-done{
    opacity: 0;
}